Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum Well

Details Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum Well Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum Well

2003-10-06

arxiv.org/abs/cond-mat/0310118v1

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevLett.92.236601

We use subpicosecond laser pulses to generate and monitor in real time collective oscillations of electrons in a modulation-doped GaAs quantum well. The observed frequencies match those of intersubband spin- and charge-density excitations. Light couples to coherent density fluctuations through resonant stimulated Raman scattering. Because the spin- and charge-related modes obey different selection rules and resonant behavior, the amplitudes of the corresponding oscillations can be independently controlled by using shaped pulses of the proper polarization.

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